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There are more parts required than just the mufflers and rear splitter.
On the vette's there is a vacuum switch that opens the 2nd port on each muffler when above 2800 rpm's.
There is an aftermarket company "mild 2 wild" that makes a remote controlled switch to keep the 2nd port open all the time, if desired, controlled by the remote control. This was very cool on the vette's and people were buying the NPP mufflers for this feature.
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